After Wisconsin woman Julie Jensen was found dead in her bed, it was uncovered that her husband, Mark Jensen, poisoned her with antifreeze, drugged her with sleeping pills and suffocated her.

We speak with experts about how conditions, like environment and temperature, affect forensic evidence when a body goes undiscovered for long periods of time.

After Diane Staudte's husband and son died, and her daughter was hospitalized, an investigation showed she, and her favorite daughter, Rachel, were responsible for their deaths.

What makes a murderer choose one killing method over another? We spoke with experts to gain insight into murder weapon preferences and what they mean.

We spoke with Joni Johnston, a forensic psychologist, to explore the ancient legacy of poisonings, the psychological profile of a homicidal poisoner and common myths and misconceptions about those who poison.

On Halloween 1974, a Texas man poisoned his young son with cyanide-laced candy in an attempt to collect the insurance money. He became known as 'The Candy Man.'

Dominick Polifrone gained the confidence of the contract killer in an undercover operation that almost cost him his life.

A&E True Crime takes a look at some of the most notable 'black widows,' and the unbelievable lengths they went to off their spouses.

The circumstances around the cult leader's death is still a mystery decades later. Was his gunshot self-inflicted? Or did someone kill him?

With the 2017 chloroform-poisoning murder of 3-year-old Mariah Kay Woods, A&E True Crime explores the history of the chemical's use and how it kills.